NDLI: Rapid analysis of occluded Pr<sub>2</sub>NH in the AlPO<sub>4</sub>-11 and VPI-5 molecular sieves by direct mass spectrometry

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Contents pages

Structure of the mixed-valence lithium cuprate Li₃Cu₂O₄ by powder neutron diffraction

Structure of new perovskite-related compounds, LiCuM₃O₉(M = Nb, Ta)

Influence of oxygen pressure on the structure of reactively deposited indium oxide films

Effect of backbone flexibility and the position of the lateral group on the mesophase stability of laterally attached, side-chain polymers

Optical properties of cresyl violet–polymer composites for quantification of humidity and ammonia gas in ambient air

Crystal structure, magnetic susceptibility and electrical conductivity of the uranium silicide carbides U₃Si₂C₂ and U₂₀Si₁₆C₃

Unusual electromagnetic shielding characteristics of inherently conducting polymer-coated metal powder/polymer composites

Morphology of electrochemically prepared polyaniline. Influence of polymerization parameters

Preparation and characterization of thermistors with negative temperature coefficient, Ni_xMn_3–xO₄(1x0.56), from formate precursors

Comparative sintering study on non-conventional and commercial silicon nitride powders

Synthesis and characterization of pure and yttrium-containing alumina aerogels

Rapid analysis of occluded Pr₂NH in the AlPO₄-11 and VPI-5 molecular sieves by direct mass spectrometry

Spin–glass behaviour of the system CoFe_2–xGa_xO₄

Layered basic copper anion exchangers: chemical characterisation and X-ray absorption study

Structural refinement using high-resolution powder X-ray diffraction data of Ca_0.5Ti₂P₃O₁₂, a low-thermal-expansion material

Materials chemistry communications. Synthesis, X-ray structure and conductivity of a new molecular conductor derived from a platinum complex: (NHMe₃)[Pt(dmit)₂]₃·CH₃CN

Photoisomerization of indolinespirobenzopyran in layered double hydroxides

1,3,5-Tris[4-(diphenylamino)phenyl]benzene and its methyl-substituted derivatives as a novel class of amorphous molecular materials

Synthesis and characterization of Group 6 metal silicide–silicon carbide composites via solid-state displacement reactions of nanosize grains of M₂C and silicon

Photobactericidal materials based on porphyrins and phthalocyanines

Lithium intercalation of LiCuTa₃O₉ and its structural change

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Back matter

Journal of Materials Chemistry Vol - 3 Issue - 2

Rapid analysis of occluded Pr₂NH in the AlPO₄-11 and VPI-5 molecular sieves by direct mass spectrometry

Content Provider	Royal Society of Chemistry (RSC)
Author	Young, David Young, Alex B.
Copyright Year	1993
Abstract	The aluminophosphate molecular sieves AlPO4-11 and VPI-5 have been prepared in the presence of dipropylamine (Pr2NH), a structure-directing organic incorporated into their synthesis gels. The AlPO4-11 molecular sieve's unidimensional channel system contains occluded Pr2NH, detected by TG, in its straight channel structural voids; VPI-5 contains no significant amount of Pr2NH (also determined via TG). The as-synthesized Pr2NH-AlPO4-11 was placed in a mass spectrometer probe (ca. 0.1 mg), which was evacuated to ca. 10–6 mbar and heated at 2 °C s–1, and its cracking pattern analysed with time. The Pr2NH cracking pattern was observed from ca. 275 °C and above, peaking at ca. 350 °C. This is assigned as Pr2NH removed from the AlPO4-11 channel system during the direct mass-spectrometric analysis. Trace amounts of Pr2NH were also observed from the as-synthesized VPI-5. For each material, the above results also indicated that the Pr2NH was unprotonated. Thus, temperatureprogrammed mass spectrometry proves to be a rapid method for the qualitative analysis of guest molecules in molecular-sieve hosts.
Starting Page	295
Ending Page	297
Page Count	3
File Format	PDF
ISSN	09599428
Volume Number	3
Issue Number	3
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9930300295
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	TG Molecular sieve Mass spectrometry Bar (unit)
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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Analysis of occluded templates in silicoaluminophosphate molecular sieves by high resolution mass spectrometry

In Situ Multinuclear Magic-Angle Spinning NMR: Monitoring Crystallization of Molecular Sieve AlPO₄-11 in Real Time.

Preparation by microwave irradiation of nanometre-sized AlPO₄-5 molecular sieve

Intermediate Phases in Synthesis of AlPO4-5 Molecular Sieve: A Study of XRD and Raman Spectroscopy

Isomorphous Substitution of Framework Atoms by Titanium in VPI-5 Aluminophosphate Molecular Sieve

Further studies on aluminophosphate molecular sieves part 2.-vpi-5 and related aluminophosphate materials.

Microwave Reaction Enhancement: The Rapid Synthesis of SAPO-11 Molecular Sieves

Alignment of a Laser Dye in the Channels of the AlPO4-5 Molecular Sieve

Simulation of alkane adsorption in the aluminophosphate molecular sieve ALPO4-5.

Rapid analysis of occluded Pr₂NH in the AlPO₄-11 and VPI-5 molecular sieves by direct mass spectrometry

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